单项选择题

过阻尼二阶系统单位阶跃响应曲线形状和一阶系统相同。（） A. 对 B. 错

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单项选择题

Which of the following statement related to the three elements in a balance sheet is not true?
A、Assets refer to the resources controlled by the firm
B、 Liabilities refer to the amounts owed to lenders and other creditors
C、Owner’s equity refers to the residual interest in the net assets of an entity that remains after deducting its liabilities
D、 Liabilities= Assets + Owners’ equity

单项选择题

首先把被调查者分成互不重叠的样本单元组，然后从每个单元组中进行简单随机抽样的方法是（）。